Light alloy and process of manufacture of the same



Patented Qct. 6, 1925.

UNITED STATES PATENT OFFICE.

ANDRE ANGELO rnnsmu, or AUBERVILLIERS, FRANCE.

LIGHT A LLOY AND PROCESS OF MANUFACTURE OF THE SAME.

NqDrawing.

To all whom it may concern:

Be it known that I, ANDRE ANGELO FRESNEAU, citizen of the French Republic,

residing at Aubervilliers,- Seine, in the zinc, magnesiuln and manganese, and the Y alloy composed of aluminium, copper, nickel and magnesium. These light alloys have in all cases a great strength, this being variable according as the metal is rolled, drawn, cast or forged.

My invention has. for its object a light alloy formed of aluminium, copper, nickel, zinc and magnesium and having approximately the following percentage composition:

Aluminium 93.32 Copper 3. 4 -Nickel- 1.0 Zinc 1.78 Magnesium O. 5

For the manufacture of the said alloy I proceed as follows: I first prepare a ternary alloy composed of:

Copper 54.5 Nickie-1 16.5 Zinc 29.0

The melted alloy is well stirred, and is then deoxidized by adding 2 percent of baryta.

I then take 6.5 kilograms of the melted and deoxidized alloy and pour the same into a crucible containing 100 kilograms of aluminium in fusion. The mixture is well stirred, and after about 5 minutes I add 500 grams of magnesium. I then add, while continuing the stirring, 2 kilograms of caustic soda which has been previously dried at a red heat. The soda renders the alumina soluble and the bath is thus made fluid; the latter is skimmed olf and is then ready for casting, which is carried out at about 7 00 C., this temperature being variable by some 15 either way.

The resulting alloy is remarkably light, its density being in fact about 2.9, but at the same time it possesses great strength.

Application filed Marchfi, 1924. Serial No. 697,395.

After 1% hours thermic treatment at about 530 (3., followed by a rapid immer- I sion in Water at about 25 (within 5- more or less) to obtain a complete cooling, and a subsequent tempering in boiling Water at 100, my alloy has the following tensile strength:

.17 to 19 kgs. per m/m for cast metal, 45 to 5'.) kgs. per m/m for drawn metal, 42' to 48 kgs. per m/m for rolled metal, 46 to 52 kgs. per m/m for forged metal.

The corresponding elongations are:

8 to 11 per cent for cast metal, 17 to 22 h per cent for, drawn metal, 17 to 22 per cent for rolled metal, 16 to 22 per cent for forged metal. a

It should also be observed that the heating and cooling curves for the said alloy show no particular features nor critical points.

Obviously, I may vary the proportions of the constituent metals of the said alloy to a-slight degree, without departing from the scope of the invention.

Having. now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A metal alloy the composition whereof is substantially: aluminium 93.3, copper 3.4, nickel 1, zinc 1.8 and magnesium 0.5.

2. The process of manufacture of a metal alloy containing aluminium, copper, nickel, zinc and magnesium which consists inpreparing a ternary alloy containing the whole amount of copper, nickel and zinc, pouring said melted ternary alloy into the melted mass of aluminium and then adding the desired quantity of magnesium.

3. The process of-manufacture of a metal alloy containing aluminium, copper, nickel, zincjand magnesium which consists in preparing a ternary alloy containing the whole amount of copper, nickel and zinc, pouring said melted ternary alloy into the melted mass of aluminium, then adding the desired quantity of magnesium, addingsubsequently anhydrous caustic soda and skimming the slag oil the bath. I

4. The process of manufacture of a metal alloy the composition whereof is substantially: aluminium 93.3, copper 3.4, nickel 1, zinc 1.8 and magnesium, which consists in preparing a ternary'alloy containing the whole amount of copper, nickel and zinc, pouring said melted ternary alloy into the melted mass of aluminium, then adding the corresponding quantity of magnesium and baryta to said ternary alloy'for deoxidi zing casting the alloy thus obtained at a temperthe same, pouring said deoxidized ternary 10 ature substantially equal to 700 C. alloy into' the melted mass of aluminium 5. The process of manufacture of a metal and then adding the desired quantity of 5 alloy containing aluminium, copper, nickel, magnesium zinc and magnesium which consists in pre- I11 est p y lI IBQf I have Signed my paring a ternary alloy containing the whole name thls speclficatlonamount of copper, nickel and zinc, adding ANDRE ANGELO FRESNEAU. 

